There are some consideration when using a camera for your
payload. First, do you want a film camera or a digital
camera?

There are two ways to handle photo taking on a balloon
flight. You can include one really good camera to take quality
pictures for all involved or you can include a camera in each of the
student built payloads.

If you are going for the one camera option get the best camera
you want because weight isn't too much of an issue.